There are several synonyms for the term "next-door-neighbor" that can be used to describe someone who lives in close proximity to you. Some of the most common synonyms include "neighbor," "adjacent resident," "neighborhood friend," and "fellow dweller." Other synonyms that can be used to describe someone who lives next door include "proximate occupant," "resident neighbor," or simply "the person next door." Regardless of the term used, it is important to foster good relationships with your neighbors as they can help create a sense of community and provide valuable support in times of need.